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No 296,875. Patented Apr. 15,1884.

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M. 1:). PORTER & E. R. WILDER. ELECTRICAL ALARM APPARATUS No. 296,875. Patented A r 15 1884.

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MAJOR DANE PORTER, OF BOSTON, llIASSAGHUSETTS, AND EDMUN D RAYNS FORD W'lLDEB, OF PORTLAND, MAINE, ASSIGNORS, BY MESNE ASSIGN- MENTS, TO SAID PORTER.

ELECTRICAL ALARM APPARATUS.

SPECIFICATION forming part of Letters Patent No. 296,875, dated April 15, 1884.

To ztZZ whom it may concern:

Be it known that we, MAJOR DANE POR- TER, a resident of Boston, in the county of Suffolk, of the Commonwealth of Massachusetts, a native of Nova Scotia, and a subject of the Queen of Great Britain, and EDMUND Riirnsronn WILDER, a resident of Portland, in the county ofCumberland, of the State of Maine, and a citizen of the United States of .10 America, have invented a new and useful Improvement in Electrical Alarm Apparatus; and we do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of

r 5 which- Figure 1 exhibits an electric circuit provided with our invention, the nature of which is defined in the claims hereinafter presented. Fig. 2 is a sketch showing thesaid invention as having applied to the electric circuit not 0 only a series of buildings having thermostats and transmitters, and also having groundwires to the latter, but having a vibratoralarm and'a gong-alarm, all being as herein;

after explained.

In Fig. 1 of such drawings, A may be supposed to represent the main circuit of a firealarm system, such circuit being properly connected with a series of buildings, having in each one or more suitable thermostats, or mechanism for closing the circuit in case of afire occurring in the buildings. The apparatus is not only to give notice to the batterystation of such circuit when an accidental break may occur in the circuit, but is also to prepare the circuit for operation while the break may continue, that, in case of fire taking place in either part of the circuit that may be beyond the break, such circuit shall be operative to give notice thereof. In Fig. 1 the battery of the circuit is shown at B, and the gronnchwire thereof at 0. Close to such battery is a relay, D, whose electro-magnet is I duly connected with the battery for the ourrent therefrom to pass through the said magnet. The circuit-wire continues from the magnet, and we usually arrange in it a key, E, for testing the circuit. Furthermore, the

circuit communicates with the stud a. of a Application filed December 11, 1883. (No model.)

switch, F. From the said stud the wire is continned, as shown at b, to another rclaythat is, to the electric magnet thereof. From the said magnet a wire, 0, leads to one or a series ot'resistance-coils, H, from which a wire, 01, has electric communication with the ground. 5 A branch wire, I, is led from the pivot of the switch-arm f to the circuit-wire A, just in advance of the key. \Vhen two or more resistance-coils are used, they are connected so that the current may pass through them succes- 6o sively, they being arranged in a circle, and provided with an arm or switch, h, jointed so as to be capable of being swung from one to the other of them, the ground-wire d in such case leading from the pivot to the switch, the whole being so as to enable one or more of such resistance coils to be put into action with the circuit, as occasion may require. The object of the resistant coil or coils is to weaken the current passing through the magnets of the two relays, so as to render it insufficient to close the armature of the relay D, though sufficient to close that of relay G, the retractlug-spring of the armatureof the relay D beingcaused with greater force to keep the ar- 7 mature from its magnet than does the spring of the relay G.

From the above it will be seen that in case of a break in the main circuit the magnet of relay G will be demagnetized, and as a con- 8 I sequence its armature will fall or be drawn away from it. 011 thus falling back this armature is to close an electrical alarm circuit, and thereby cause an alarm to be sounded, to give notice that the main circuit has been bro- 8 5 ken. On such an alarm being given, the arm f of the switch F is to be turned upon the stud a, in which case the armature of relay G will be closed or drawn up to its magnet, and the alarm will cease to sound, and the current will flow through the wireI; Now, should a fire occur in any building through which the main circuit A may run, and the thermostat in such building be caused thereby to close the circuit, such thermostat having a ground-com nection, the armatureof relay D would be drawn to its magnet, and the armature of relay G would fall away from its magnet, and

thus notice by this action of the relay D would be given of the existence of such fire. Should the armature of relay D have applied to it the circuit of an electric alarm, such armature may be usedto close the said circuit, so as to cause its alarm to be sounded thereby. The key E is to be closed while the apparatus is without.

ing are marked in their order, a", I), and c In said Fig. 2 the main wires of the circuit are marked in, and the gIOUIICIWiIQS 9, there being in each story of each buildingthat is,

to its main and ground wiresone or more thermostats, d, of some proper or well-known kind. There is also in the lower story of each building a transmitter, c, of suitable con struction. Furthermore, in said Fig. 2, M denotes whatis usually termeda vibratory electricalarm, andNa"gongelectricalarin, with their localbatteries shown at O and P, and

' circuit-wiresf, g", h, and i, to connect them Although we have represented the circuit A substantially as usually applied to a series.

of buildings provided with thermostats, transmitters, and main and ground wires, and have also exhibited the usual vibratory and gong alarms, and with such devices for sounding alarms in case of a fire occurring in any story of any of such buildings, we wish it distinctly understood that we make no claim to such.

WVe claim-- 1. The combination of the electric alarm circuit A, battery B, switch F, auxiliary wire I, two relays, D and G, and one or more resistance-coils, H, all being adapted or applied substantially to operate as and for the purpose or purposes as set forth.

2. The combination of the electrical'arm circuit'A, battery B, switch F, two relays, D and G, one or more resistance-coils, H, auxiliary wire I, and the connectingwires b 0, constructed and arranged as described.

3. The combination of the electric -alarn1 circuit A, battery 13, switch F, having the stud a and switch-arm f, two relays, D and G, the resistance-coils H and their arm h, auxiliary' wire I, and connecting-wires I) c, all constructed and arranged as and for the purpose Set forth.

MAJOR DANE PORTER. EDMUND RAYNSFORI) WILDER.

\Vitnesses:

R. H. EDDY, E. B. PRATT. 

